Multi-dimensional Applications of Performance-based Design in Structural Engineering
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摘要: 在抗震设计领域,性能化设计通过将传统规范设计方法中宏观定性的设防目标转化为可量化分析的多层级性能目标,并结合数值仿真分析结构响应与性能评价,采取针对性措施,以满足结构抗震设计的个性化需求。除抗震外,性能化设计理念也可拓展至抗风、抗火、振动控制等多目标领域。然而,不同领域的性能化设计体系通常围绕特定作用类型或专项需求发展,在作用描述、分析方法及性能指标等方面存在差异,缺乏统一的设计逻辑框架,导致面向多目标性能需求时,设计过程存在一定程度的碎片化问题。针对上述问题,提出基于作用、空间、时间和技术四个维度的性能化设计框架。其中,作用维度用于描述地震、风、振动、火灾等不同外部作用类型及其强度水平,明确不同作用条件下对应的性能目标;空间维度从整体结构、构件及节点等层级,明确性能目标的实现机制,建立满足性能需求的合理力学响应分配;时间维度考虑作用过程、结构状态演化及响应发展的时间相关性与耦合关系;技术维度针对既定性能目标,从分析方法及技术措施等方面确定相应的实现途径。结合多个实际工程案例,分别探讨四维度性能化设计框架在抗风、抗震、振动控制及复杂结构设计中的应用。结果表明,所提出的四维度框架能够较为系统地归纳不同领域性能化设计涉及的核心问题,建立外部作用、结构体系、性能演化及技术实现之间的内在关联关系,有助于提高不同专项性能化设计过程的系统性与可实施性,并为复杂结构多目标性能设计提供参考。针对未来出现的新型专项性能化设计需求,可基于该框架开展设计任务分解与技术路径的高效组织。Abstract: In the field of seismic design, performance-based design (PBD) transforms the macroscopic and qualitative seismic fortification objectives of traditional code-based methods into quantitative, multi-level performance objectives. By combining structural response analysis based on numerical simulations with performance assessment and targeted measures, PBD addresses the individualized requirements of seismic design. Beyond seismic design, the PBD philosophy can also be extended to multiple domains, including wind resistance, fire resistance, and vibration control. However, PBD systems in different domains have generally evolved around specific action types or specialized requirements, exhibiting discrepancies in action characterization, analytical methods, and performance indicators. The absence of a unified design framework leads to a certain degree of fragmentation in the design process when addressing multi-objective performance requirements. To address these issues, this paper proposes a PBD framework based on four dimensions: action, space, time, and technology. The action dimension is intended to describe different external action types, such as seismic, wind, vibration, and fire actions, and their intensity levels, and to clarify the performance objectives corresponding to different action conditions. The space dimension defines the mechanism for achieving performance objectives at levels ranging from the overall structure to individual members and joints, and establishes rational mechanical response distributions that satisfy performance requirements. The time dimension accounts for the time dependence and coupling relationships among the action process, structural state evolution, and response development. The technology dimension, given established performance objectives, determines the corresponding implementation pathways in terms of analytical methods and technical measures. Through several practical engineering cases, the application of the four-dimensional PBD framework is examined in four domains: wind resistance, seismic resistance, vibration control, and complex structural design. The results demonstrate that the proposed four-dimensional framework can relatively systematically summarize the core issues addressed by PBD across different domains, establish the intrinsic relationships among external actions, structural systems, performance evolution, and technical implementation, help enhance the systematic nature and feasibility of specialized PBD processes, and provide a reference for the multi-objective PBD of complex structures. For emerging specialized PBD requirements in the future, this framework can be leveraged to decompose design tasks and efficiently organize technical pathways.
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